製作一個按鈕類

Question

我遇到的問題是搞清楚如何將我的按鈕類鏈接到我的主程序。我意識到我有很多來自外部類的方法，所以我會盡量給出一個概述。基本上我有一個引用的arrayList和從字母表的隨機排列創建的一個鍵。我使用這個密鑰來「加密」報價。通過這種方法：

public static String translate (String text, String key) 
    { 
     String newText = ""; 
     for(int i = 0; i < text.length(); i++) 
     { 
      char currentLetter = text.charAt(i); 
      if(ALPHA.contains(Character.toString(currentLetter))) 
      { 
       int index = ALPHA.indexOf(currentLetter); 
       char newLetter = key.charAt(index); 
       newText = newText + text.substring(i, i + 1).replace 
        (currentLetter, newLetter) ; 
      } 
      else 
       newText = newText + currentLetter; 
     } 
     return newText; 
    } 

所以我想要做的就是有一個按鈕，需要用戶輸入並與輸入引號替換字母。我沒有使用JButton，我正在使用庫來製作正方形，然後使用mouseEvent。

import wheelsunh.users.*; 
import java.awt.Color; 
import java.awt.event.MouseEvent; 
import javax.swing.JOptionPane; 

/** 
* Creates a button 
* 
* @author Scott 
*/ 
public class SubstituteButton extends RoundedRectangle 
{ 
    String response; 

    public SubstituteButton(int x, int y) 
    { 
     super(x, y); 
     super.setSize(20, 20); 
     super.setFillColor(Color.LIGHT_GRAY); 
     super.setFrameColor(Color.BLACK); 
    } 

    public void mousePressed(MouseEvent e) 
    { 
     super.setFillColor(new Color(131,111,255)); 

     try 
     { 
     response = JOptionPane.showInputDialog("Which letter" 
      + " would you like to replace? Ex. ab would replace all a's" 
      + " with b's"); 
     } 
     catch(NullPointerException exeception) 
     { 
      JOptionPane.showMessageDialog(null, "Input Error"); 
     } 

     super.setFillColor(Color.LIGHT_GRAY);  
    } 

    public String getInput() 
    { 
     if(response.length() == 2 && 
      Character.isLetter(response.charAt(0)) && 
      Character.isLetter(response.charAt(1))) 
     { 
      return response; 
     } 
     return null; 
    } 
    public static void main(String args[]) 
    { 
     new Frame(); 
     new SubstituteButton(100, 100); 
    } 
} 

HSO我怎麼會更新顯示的報價，從而替代的字母：我在一個單獨的類在這裏所作的按鈕？我以爲我可以在按鈕類中使用replace()方法，但它不會更新顯示的引用。這裏是主程序：

import wheelsunh.users.*; 
import java.util.*; 
import java.lang.Character; 

/** 
* Displays a quote with letters in blocks and punctuation without blocks. 
* If a letter has been changed from the original then it is highlighted. 
* Displayed lines must be broken to stay on frame. 
* 
* 
* @author Scott 
*/ 
public class CryptogramApp extends ShapeGroup 
{ 
    private ArrayList<String> blockQuote; 
    private int quoteLength; 
    private SubstituteButton substituebutton; 
    private boolean newState = true; 
    private String key, quote, encryptedQuote; 

    /** 
    * Creates a block-quote with first letter at initialX,initialY 
    * with the text from quote. 
    * 
    * @param initialX int 
    * @param initialY int 
    * @param quote String 
    */ 
    //-------------------------------------------------------------------------- 
    public CryptogramApp(int initialX, int initialY) 
    {   
     if(newState == true) 
      newQuote(); 

     int newx = initialX; 

     for(int i = 0; i < quote.length(); i++) 
     { 
      String letter = Character.toString(encryptedQuote.charAt(i)); 
      BlockLetter b = new BlockLetter(newx, initialY, letter); 
      newx += BlockLetter.WIDTH; 

      if(letter.equals(" ") && b.getXLocation() > 400) 
      { 
       newx = initialX; 
       initialY += 40; 
      } 
     } 
     newState = false; 

    } 
    public void newQuote() 
    { 
     blockQuote = new ArrayList<String>(); 
     key = StringUtilities.getRandomKey(); 
     quote = getRandomQuote(); 
     System.out.println(key); 
     encryptedQuote = StringUtilities.translate(quote, key); 
     System.out.println(encryptedQuote); 
     substituebutton = new SubstituteButton(425, 350); 
    } 
    //-------------------------------------------------------------------------- 
    /** 
    * Returns the String text with the jth character replaced with key. 
    * 
    * @param text String 
    * @param key String 
    * @param j int 
    * 
    * @return String 
    */ 
    public String getRandomQuote() 
    { 
     Random gen = new Random(); 
     ArrayList<String> list = StringUtilities.getQuotes(); 
     String quote = list.get(gen.nextInt(6)); 
     return quote; 
    } 

    //-------------------------------------------------------------------------- 
    /** 
    * Runs a simple test of CryptogramApp. 
    * 
    * @param args String[] 
    */ 
    public static void main(String args[]) 
    { 
     new Frame(700, 500); 
     new CryptogramApp(20, 50); 

    } 
} 

Answer 1

@MadProgrammer顯然是正確的。你爲什麼沒有分類JButton ??

現在你的代碼，

目前尚不清楚，你收到了什麼錯誤，或者什麼都不爲你工作。

你應該有

public class SubstituteButton extends RoundedRectangle implements MouseListener 

，並在某些階段

SubstituteButton button=new SubstituteButton(); 
button.addMouseListener(button) 

？這會將你的按鈕連接到監聽器。

另外，你在哪裏添加按鈕到框架？ 請發佈完整的代碼。